PART VII. Post-Strike Mint Modifications:

Edge Lettering:

Two Sets of Edge Letters

Definition: This error occurs when a coin is sent through the edge lettering device two times.

It is mainly the John Adams 2007-P dollar coin that has this type of edge lettering error. At least three 2007-P George Washington dollars have also been reported with a double set of letters. The two sets of letters can occupy one of three positions relative to each other and the obverse face:

Two sets of edge letters in position “A”. Here the top of each letter points toward the obverse face.
Two sets of edge letters in position “B”. Here the top of each letter points toward the reverse face.
Two sets of edge letters; one in position “A”, the other in position “B”.

The above image shows two sets of edge letters oriented in the
same direction.
Image is courtesy of Fred Weinberg.

The above image shows two sets of edge letters pointing in two different directions. This is more commonly referred to as inverted edge lettering on coin encapsulated labels.

Images are courtesy of Fred Weinberg.